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12.670 leagues is about three-fifths as long as The 405.

In other words, it's 0.604040 times the length of The 405, and the length of The 405 is 1.65550 times that amount.

(a.k.a. I-405, Interstate 405, San DIego Freeway) (Southern California)
Running from Irvine to San Fernando, The 405 runs a total of 20.9760 leagues. The 405 is the most heavily-trafficed freeway in the United States, with an average speed as low as 8 kph during rush hours.